Police said a 24-year-old man fell to his death on Saturday from the 21st floor of a high-rise building in a busy shopping and entertainment area of Chicago.

Chicago police said investigators are trying to determine if the unidentified man fell accidentally or there were other circumstances.

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The man was found a little over a block away from the Chicago River, which was dyed green for St. Patrick's Day. A police spokesman said it is not yet known if the incident had anything to do with St. Patrick's Day partying.